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I would recommend that you do NOT wet the back of the canvas if the canvas is oil primed. If it's acrylic primed it will be OK to wet it. I had the unfortunate experience of having a frame shop wet the back of one of my portraits, the paint fell off the front. Oil primed canvas is coated with water soluble rabbit skin glue before the white lead, or white paint is applied. If the rabbit skin glue is wet from the back it can have disastrous results. If you wet it at all do it very lightly with very little moisture.
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